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100mm Aluminum Loop Block

Part No. 3245

Sheave Ø (mm) 100 mm

Sheave Ø (in) 3 15/16 in

Maximum line Ø (mm) 16 mm

Maximum line Ø (in) 5/8 in

Maximum working load (kg) 3402 kg

Maximum working load (lb) 7500 lb

Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. The sheave center carries primary load, allowing a smaller, lighter weight block. The soft-attachment Loop block has a removable deadend post for attachment to a padeye. Lashings can also be used. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Sheave Ø (mm)100 mm
Sheave Ø (in)3 15/16 in
Length (mm)128 mm
Length (in)5 1/16 in
Weight (g)371 g
Weight (oz)13.09 oz
Maximum line Ø (mm)16 mm
Maximum line Ø (in)5/8 in
Maximum working load (kg)3402 kg
Maximum working load (lb)7500 lb
Breaking load (kg)6804 kg
Breaking load (lb)15000 lb
Composer Export254163BOM IDDescriptionQty1AL-3427 DEAD END POST12AL-3751 ALPHA CHEEK13AL-3752 BETA CHEEK14H-34391A SHEAVE ASSM.15HBB87 ROLLER CAGE ASSM.16HFS1271 FST. 6 X 1 X 16MM SHCS1tooltip
ID BOM Qty Price
AL-3751 1 more info

Sideplate with Helicoil - 100 mm Black Magic Loop Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.

AL-3752 1 more info

Sideplate with Isolator - 100 mm Black Magic Loop Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.

AL-3427 1 more info $23.55
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Dead-End Post - 100 mm Black Magic Loop Block

Patented Loop blocks have a removable deadend post for attachment to a padeye.

HBB87ASSY 1 more info

Roller Cage Assembly - 100 mm Black Magic Block

Center cage keeps Torlon® roller bearings separated and parallel to reduce friction.

HFS1271 1 more info $0.54
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Fastener - M6 x 1 x 16 mm Socket Head Cap Screw, Black

Fasten with M6 hex wrench.

H-34391A 1 more info $81.30
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Sheave Assembly - 100 mm Black Magic Block

Sheaves are Hard Lube-anodized for maximum UV protection and a smooth surface. Captive Delrin® ball bearings carry side loads.

Harken US Offices will be closed for Memorial Day. Any orders placed after 1pm on Friday May 27th will be processed Tuesday May 31st when offices reopen.

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